 If you liked
Gunslinger Girl
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 ...then you might like
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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The storylines of both animes are standing on totally different edges, but the real core of them have some similarities: a group of friends that deals with new and different feelings and endure hard challenges (and bullets, in Gunslinger case) to stick together. Good dramas with very touching endings.